Grain-door table



Dec. 13, 1927.

L. SMITH GRAIN DOOR TABLE Patented Dec. :13, 1927. 1,652,802 .UNITEDSTATES PATENT OFFICE.

LEONARD SMITH, OF BASTROP, LOUISIANA, AS IGNOR TO M.

CHICAGO, ILLINOIS.

A. MUMMERT, OF

GRAIN-DOOR TABLE.

Application filed April 18, 1927. Serial No. 184,480.

of the nailing top sheet 11. A helicallycoiled expanding spring isinterposed between each of the eyes and a washer 21 restlng against thehead 22 of the bolt, so that the clamping bar is drawn outwardly by thesprings 20 so as to keep it in engagement with the two eccentric disks23 by which the bar is moved. These eccentric disks 23 are preferablyjournaled on the bolts 2%, which, as best seen in Fig. 2, projectupwardly through the pair of metallic reinforcing strips 25 extendingtransversely of the nailing top sheet and secured thereto by the screwsor rivets 26, the heads of the bolts resting againstthe under sides ofthe strips 25, while the upper portion 27 thereof, which forms thebearing for the eccentric block 23, is reduced in diameter, as shown,and the bolts and eccentric blocks are -held in place by the nuts 28, aswill be readily understood. To turn the eccentric blocks 23, I providethe handle bars 29, which are preferably steel rods, which are passedthrough the projection 30 formed on the top of the eccentric disk 23,and having an aperture of the right size to receive the handle 29 passedtherethrough, preferably at a slight angle to the horizontal, so thatwhen the operator pulls the end of the bar over the channel 16, his handwill not strike the channel. The handle is secured in any desiredadjustment for its length by the set screw 31.

Sometimes it is desirable to make grain doors that are slightly narrowerthan the standard width, and in order to make the apparatus operate moreefliciently upon such narrow doors, I pivot on the rear vertical flangeof the channel bar 16 the pair of short spacing bars 32, which are shownas turned over out of the way and not in use. It will be understood thatwhen it is desired to use them, they will be turned over on their pivotsuntil they rest between the clamping table lengthwise with their endsengaging bar channel 16 and the eccentrics 23. It will the abutment 15.also be noted that the clamping bar is held The movable clampingmechanism consists in its approximate position by the action of of amovable clamping bar 16, which is prefthe bolts 17, but it is preventedfrom any erably composed of a channel bar three substantial longitudinaldisplacement by reainchcs wide and having inch and a half verson of thefact that one end thereof substantical flanges, and extending, as shown,subtially contacts with the abutment 15, while stantially the entirelength of the table. It the other end thereof will substantially conhassecured in the ends thereof the rods 17, tact with the vertical flangeof the similar which may be held by the nuts 18, and which but shorterabutment 33. It will be underextend through the eyes 19 projectingupstood, of course, that the abutment 33 is ward from the edges of theadjacent side shortened up so as not to interfere with the My inventionis concerned with grain door tables or clamps, which are used in themanufacture of grain doors to hold the longitudinally extending piecesof lumber constituting the body of the door tightly pressed togetherwhile the transverse battens are being nailed in place to hold thelongitudinally extending pieces rigidly together to form the completedoor, and it is dcsigned to pro- 30 duce a device of the class describedwhich shall be simple in its construction, easily operated, andcommercially eflicient.

To illustrate my invention, I annex hereto a. sheet of drawings in whichthe same reference characters are used to designate identical parts inall the figures; of which,-

Fig. 1 is a top plan view of the table;

Fig.2 is a vertical section on the line 22 of Fig. 1, but on a largerscale; and

Fig. 3 is a perspective view of one corner thereof, on a still largerscale.

In carrying out my invention in its preferred form, I employ a woodenframe 10, of any desired construction, and preferably consisting of therectangular body portion and four or six legs to support the same, andon top of this table I secure the nailing top sheet 11, which preferablyconsists of a piece of sheet steel large enough to cover the top, andpreferably three-eighths of an inch in thickness. This may be secured tothe frame by screws 12 at the edges thereof, or in any desired manner.On one side of the table, I form a rigid abutment 13 extending thelength thereof, and preferably formed of a strip of angle iron with avertical flange projecting upward, say, an inch and a half,- and atwo-inch horizontal flange secured to the edge of the nailing top sheet11 by rivets 1 1. A similar abutment 15, preferably composed of angleiron and similarly secured, is located at one end, and it will beunderstood that the boards are placed on the its purposes, it

shoving of the boards on to the nailing top sheet from that end.

The use of my improved apparatus will be readily understood. The twonailers stand on the side carrying the abutment 13, and thelongitudinally extending pieces of the door are placed on thenailingtopsheet between the abutment 13 and the clamping member 16 withtheir ends engaging the abutment 15, and when the number to make thedoor are, in place, the operators reach across the table and turn theeccentrics 23 by hand until the clamping bar 16 engages the adjacent'piece of lumber, when the hands are shifted to the ends of the levers 29and thereby pulled toward the operator and powerful. pressure thusproduced. It will be understood that with the parts as shown in Fig. 1,the operators turn the eccentric disk 23 by hand anti-clockwise, andthatwhen it is necessary to take hold of the handles29 they will have beenswung aroundfthrough something less than one hundred andeighty degrees,so that the final pull on the handles is directly toward the operators,so that the power 18 applied most efficiently. Then the boards are thusclamped between the abutment 13 and the ,bar 16, the handles arereleased and the nailwhichthe movement of the the finished door.described my ining done, after handles is reversed totree Vlhile I haveshown and vention as embodied in the present consider'best adapted tocarryout willbe understood that it is capable of modification, and thatI do not desire tobe limited in the interpretation of the followingclaims except as may be necessitated by the state of the prior art.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is:

1. In a device of the class described, the combination with a nailingtop sheet, of a rigid abutment located'on one side thereof, a movableclamping bar opposedto the abutment, a pair cal axes located adjacentthe clamping bar, handles swinging in asubstantially horizontal planeconnected to said eccentrics, and guiding means to hold the outer sideof said clamping bar yieldingly against the eccentrics, said meansconsisting of a pair of rods secured to and extending rearwardly fromthe ends ofthe bar, stationary eye pieces through which the rods pass,and h-elically coiled expanding springs inter; posed between the eyesand abutments on the outer ends o-f the rods.

2. In a device of the class described, the combination with a nailingtop sheet, or a rigid abutment located on one side thereof, a movableclamping bar opposed-to the abutment, a pair of eccentrics journaled onvertical axes located adjacent the clamping bar,

handles swinging in asubstantially horiform which I at of eccentricsjournaledon verti zontal plane connected to said eccentrics, and a pairo'l? short spacing bars pivoted to the rear of the clamping bar andadapted to be turned into or out of engagement with the eccentrics. i'

3. In a grain door table, the combination with a nailing top sheet, of arigid abutment located on one side thereof, a movable clamping baropposed to the abutment sliding on the nailing top sheet, a pair ofcocentrics journaled on vertical axes located adjacent'the clamping bar,means to keep the adjacent side of the clamping bar in contact with theeccentrics, and handles swinging in a substantially horizontal planeconnected to said eccentrics, said abutment and said clamping baradapted to have a grain door clamped directly between them,

t. In a grain door table, the combination with a nailing top sheet, of arigid abutment located on one side thereot, a movable clamping baropposed to the abutment sliding on the nailing top sheet, a pair ofeccentrics journaled on vertical axes located adjacent the clamping bar,handles swinging in a substantially horizontal plane connected to saideccentrics, said abutment and said clamping bar adapted to have a graindoor clamped directly etween them, and guiding means to hold the outerside of said clamping bar at both ends yieldingly against'theeccentrics.

5. In a grain door table, the combination with a nailing top sheet, of arigid abutment located on one side thereoha movable clamping bar opposedto the abutment sliding on the nailing top sheet, a pair of eccentricsjournaled on vertical axes located adjacent the clamping bar, handlesswinging in substantially horizontal plane connected to said eccentrics,said abutment and said clamping bar adapted to have a grain door clampeddirectly between them, guiding means to hold the outer side of saidclampingbar yieldingly against the eccentrics, and a pair of transversebars secured to the nailing top sheet and adapted to engage the ends ofthe clamping bar it the latter is displaced longitudinally. I

6. In a grain door table, the combination with a nailing top sheet, of arigid abutment located on one sidethereoit, a movable clamping baropposed tothe abutment sliding on the nailing top sheet, a pair ofeccentrics journaled on vertical axes located adjacent the clan'ipingbar, means to keep. the ad jacent side of the clamping bar in contactwith the eccentrics, and handles swinging in a substantially horizontalplane but slanting slightly upward connected to said eccentrics, saidabutment and said clamping bar adapt ed to have a graindoorclampedfdirectlv between them. V I I Inwitness whereof, I havehereuntoset myhand this 16th day of April, 1927.

. LEONARD SMITH.

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